Rollup merge of #157459 - Gelbpunkt:callconv-powerpc64-unset-abi-unreachable, r=RalfJung rustc_target: callconv: powerpc64: Remove unreachable fallback code path This is effectively dead code now that we validate the target spec, so let's mark it as unreachable to avoid misleading people looking at this code. --- Alternatively we could use `cfg_abi` in this code and match on `ElfV1` / `ElfV2` / `VecExtAbi`, but... AIX remains a mystery to me and it would boil down to the same 3 branches and an unreachable fallback. r? @RalfJung
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